876, 452 + 23,578
round to the nearest yor
thousand then add.

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

What is the absolute value of the complex number -4-sqrt2i

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?